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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2009 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.collect;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkArgument;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import static com.google.common.base.Preconditions.checkElementIndex;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>import com.google.common.annotations.Beta;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import com.google.common.annotations.GwtCompatible;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import com.google.common.annotations.GwtIncompatible;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import com.google.common.base.Objects;<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.io.Serializable;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.lang.reflect.Array;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.util.AbstractCollection;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import java.util.AbstractSet;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import java.util.Arrays;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import java.util.Collection;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import java.util.Iterator;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import java.util.List;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import java.util.Map;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import java.util.Set;<a name="line.37"></a>
<span class="sourceLineNo">038</span><a name="line.38"></a>
<span class="sourceLineNo">039</span>import javax.annotation.Nullable;<a name="line.39"></a>
<span class="sourceLineNo">040</span><a name="line.40"></a>
<span class="sourceLineNo">041</span>/**<a name="line.41"></a>
<span class="sourceLineNo">042</span> * Fixed-size {@link Table} implementation backed by a two-dimensional array.<a name="line.42"></a>
<span class="sourceLineNo">043</span> *<a name="line.43"></a>
<span class="sourceLineNo">044</span> * &lt;p&gt;The allowed row and column keys must be supplied when the table is<a name="line.44"></a>
<span class="sourceLineNo">045</span> * created. The table always contains a mapping for every row key / column pair.<a name="line.45"></a>
<span class="sourceLineNo">046</span> * The value corresponding to a given row and column is null unless another<a name="line.46"></a>
<span class="sourceLineNo">047</span> * value is provided.<a name="line.47"></a>
<span class="sourceLineNo">048</span> *<a name="line.48"></a>
<span class="sourceLineNo">049</span> * &lt;p&gt;The table's size is constant: the product of the number of supplied row<a name="line.49"></a>
<span class="sourceLineNo">050</span> * keys and the number of supplied column keys. The {@code remove} and {@code<a name="line.50"></a>
<span class="sourceLineNo">051</span> * clear} methods are not supported by the table or its views. The {@link<a name="line.51"></a>
<span class="sourceLineNo">052</span> * #erase} and {@link #eraseAll} methods may be used instead.<a name="line.52"></a>
<span class="sourceLineNo">053</span> *<a name="line.53"></a>
<span class="sourceLineNo">054</span> * &lt;p&gt;The ordering of the row and column keys provided when the table is<a name="line.54"></a>
<span class="sourceLineNo">055</span> * constructed determines the iteration ordering across rows and columns in the<a name="line.55"></a>
<span class="sourceLineNo">056</span> * table's views. None of the view iterators support {@link Iterator#remove}.<a name="line.56"></a>
<span class="sourceLineNo">057</span> * If the table is modified after an iterator is created, the iterator remains<a name="line.57"></a>
<span class="sourceLineNo">058</span> * valid.<a name="line.58"></a>
<span class="sourceLineNo">059</span> *<a name="line.59"></a>
<span class="sourceLineNo">060</span> * &lt;p&gt;This class requires less memory than the {@link HashBasedTable} and {@link<a name="line.60"></a>
<span class="sourceLineNo">061</span> * TreeBasedTable} implementations, except when the table is sparse.<a name="line.61"></a>
<span class="sourceLineNo">062</span> *<a name="line.62"></a>
<span class="sourceLineNo">063</span> * &lt;p&gt;Null row keys or column keys are not permitted.<a name="line.63"></a>
<span class="sourceLineNo">064</span> *<a name="line.64"></a>
<span class="sourceLineNo">065</span> * &lt;p&gt;This class provides methods involving the underlying array structure,<a name="line.65"></a>
<span class="sourceLineNo">066</span> * where the array indices correspond to the position of a row or column in the<a name="line.66"></a>
<span class="sourceLineNo">067</span> * lists of allowed keys and values. See the {@link #at}, {@link #set}, {@link<a name="line.67"></a>
<span class="sourceLineNo">068</span> * #toArray}, {@link #rowKeyList}, and {@link #columnKeyList} methods for more<a name="line.68"></a>
<span class="sourceLineNo">069</span> * details.<a name="line.69"></a>
<span class="sourceLineNo">070</span> *<a name="line.70"></a>
<span class="sourceLineNo">071</span> * &lt;p&gt;Note that this implementation is not synchronized. If multiple threads<a name="line.71"></a>
<span class="sourceLineNo">072</span> * access the same cell of an {@code ArrayTable} concurrently and one of the<a name="line.72"></a>
<span class="sourceLineNo">073</span> * threads modifies its value, there is no guarantee that the new value will be<a name="line.73"></a>
<span class="sourceLineNo">074</span> * fully visible to the other threads. To guarantee that modifications are<a name="line.74"></a>
<span class="sourceLineNo">075</span> * visible, synchronize access to the table. Unlike other {@code Table}<a name="line.75"></a>
<span class="sourceLineNo">076</span> * implementations, synchronization is unnecessary between a thread that writes<a name="line.76"></a>
<span class="sourceLineNo">077</span> * to one cell and a thread that reads from another.<a name="line.77"></a>
<span class="sourceLineNo">078</span> *<a name="line.78"></a>
<span class="sourceLineNo">079</span> * &lt;p&gt;See the Guava User Guide article on &lt;a href=<a name="line.79"></a>
<span class="sourceLineNo">080</span> * "http://code.google.com/p/guava-libraries/wiki/NewCollectionTypesExplained#Table"&gt;<a name="line.80"></a>
<span class="sourceLineNo">081</span> * {@code Table}&lt;/a&gt;.<a name="line.81"></a>
<span class="sourceLineNo">082</span> *<a name="line.82"></a>
<span class="sourceLineNo">083</span> * @author Jared Levy<a name="line.83"></a>
<span class="sourceLineNo">084</span> * @since 10.0<a name="line.84"></a>
<span class="sourceLineNo">085</span> */<a name="line.85"></a>
<span class="sourceLineNo">086</span>@Beta<a name="line.86"></a>
<span class="sourceLineNo">087</span>@GwtCompatible(emulated = true)<a name="line.87"></a>
<span class="sourceLineNo">088</span>public final class ArrayTable&lt;R, C, V&gt; implements Table&lt;R, C, V&gt;, Serializable {<a name="line.88"></a>
<span class="sourceLineNo">089</span><a name="line.89"></a>
<span class="sourceLineNo">090</span>  /**<a name="line.90"></a>
<span class="sourceLineNo">091</span>   * Creates an empty {@code ArrayTable}.<a name="line.91"></a>
<span class="sourceLineNo">092</span>   *<a name="line.92"></a>
<span class="sourceLineNo">093</span>   * @param rowKeys row keys that may be stored in the generated table<a name="line.93"></a>
<span class="sourceLineNo">094</span>   * @param columnKeys column keys that may be stored in the generated table<a name="line.94"></a>
<span class="sourceLineNo">095</span>   * @throws NullPointerException if any of the provided keys is null<a name="line.95"></a>
<span class="sourceLineNo">096</span>   * @throws IllegalArgumentException if {@code rowKeys} or {@code columnKeys}<a name="line.96"></a>
<span class="sourceLineNo">097</span>   *     contains duplicates or is empty<a name="line.97"></a>
<span class="sourceLineNo">098</span>   */<a name="line.98"></a>
<span class="sourceLineNo">099</span>  public static &lt;R, C, V&gt; ArrayTable&lt;R, C, V&gt; create(<a name="line.99"></a>
<span class="sourceLineNo">100</span>      Iterable&lt;? extends R&gt; rowKeys, Iterable&lt;? extends C&gt; columnKeys) {<a name="line.100"></a>
<span class="sourceLineNo">101</span>    return new ArrayTable&lt;R, C, V&gt;(rowKeys, columnKeys);<a name="line.101"></a>
<span class="sourceLineNo">102</span>  }<a name="line.102"></a>
<span class="sourceLineNo">103</span><a name="line.103"></a>
<span class="sourceLineNo">104</span>  /*<a name="line.104"></a>
<span class="sourceLineNo">105</span>   * TODO(jlevy): Add factory methods taking an Enum class, instead of an<a name="line.105"></a>
<span class="sourceLineNo">106</span>   * iterable, to specify the allowed row keys and/or column keys. Note that<a name="line.106"></a>
<span class="sourceLineNo">107</span>   * custom serialization logic is needed to support different enum sizes during<a name="line.107"></a>
<span class="sourceLineNo">108</span>   * serialization and deserialization.<a name="line.108"></a>
<span class="sourceLineNo">109</span>   */<a name="line.109"></a>
<span class="sourceLineNo">110</span><a name="line.110"></a>
<span class="sourceLineNo">111</span>  /**<a name="line.111"></a>
<span class="sourceLineNo">112</span>   * Creates an {@code ArrayTable} with the mappings in the provided table.<a name="line.112"></a>
<span class="sourceLineNo">113</span>   *<a name="line.113"></a>
<span class="sourceLineNo">114</span>   * &lt;p&gt;If {@code table} includes a mapping with row key {@code r} and a<a name="line.114"></a>
<span class="sourceLineNo">115</span>   * separate mapping with column key {@code c}, the returned table contains a<a name="line.115"></a>
<span class="sourceLineNo">116</span>   * mapping with row key {@code r} and column key {@code c}. If that row key /<a name="line.116"></a>
<span class="sourceLineNo">117</span>   * column key pair in not in {@code table}, the pair maps to {@code null} in<a name="line.117"></a>
<span class="sourceLineNo">118</span>   * the generated table.<a name="line.118"></a>
<span class="sourceLineNo">119</span>   *<a name="line.119"></a>
<span class="sourceLineNo">120</span>   * &lt;p&gt;The returned table allows subsequent {@code put} calls with the row keys<a name="line.120"></a>
<span class="sourceLineNo">121</span>   * in {@code table.rowKeySet()} and the column keys in {@code<a name="line.121"></a>
<span class="sourceLineNo">122</span>   * table.columnKeySet()}. Calling {@link #put} with other keys leads to an<a name="line.122"></a>
<span class="sourceLineNo">123</span>   * {@code IllegalArgumentException}.<a name="line.123"></a>
<span class="sourceLineNo">124</span>   *<a name="line.124"></a>
<span class="sourceLineNo">125</span>   * &lt;p&gt;The ordering of {@code table.rowKeySet()} and {@code<a name="line.125"></a>
<span class="sourceLineNo">126</span>   * table.columnKeySet()} determines the row and column iteration ordering of<a name="line.126"></a>
<span class="sourceLineNo">127</span>   * the returned table.<a name="line.127"></a>
<span class="sourceLineNo">128</span>   *<a name="line.128"></a>
<span class="sourceLineNo">129</span>   * @throws NullPointerException if {@code table} has a null key<a name="line.129"></a>
<span class="sourceLineNo">130</span>   * @throws IllegalArgumentException if the provided table is empty<a name="line.130"></a>
<span class="sourceLineNo">131</span>   */<a name="line.131"></a>
<span class="sourceLineNo">132</span>  public static &lt;R, C, V&gt; ArrayTable&lt;R, C, V&gt; create(Table&lt;R, C, V&gt; table) {<a name="line.132"></a>
<span class="sourceLineNo">133</span>    return new ArrayTable&lt;R, C, V&gt;(table);<a name="line.133"></a>
<span class="sourceLineNo">134</span>  }<a name="line.134"></a>
<span class="sourceLineNo">135</span><a name="line.135"></a>
<span class="sourceLineNo">136</span>  /**<a name="line.136"></a>
<span class="sourceLineNo">137</span>   * Creates an {@code ArrayTable} with the same mappings, allowed keys, and<a name="line.137"></a>
<span class="sourceLineNo">138</span>   * iteration ordering as the provided {@code ArrayTable}.<a name="line.138"></a>
<span class="sourceLineNo">139</span>   */<a name="line.139"></a>
<span class="sourceLineNo">140</span>  public static &lt;R, C, V&gt; ArrayTable&lt;R, C, V&gt; create(<a name="line.140"></a>
<span class="sourceLineNo">141</span>      ArrayTable&lt;R, C, V&gt; table) {<a name="line.141"></a>
<span class="sourceLineNo">142</span>    return new ArrayTable&lt;R, C, V&gt;(table);<a name="line.142"></a>
<span class="sourceLineNo">143</span>  }<a name="line.143"></a>
<span class="sourceLineNo">144</span><a name="line.144"></a>
<span class="sourceLineNo">145</span>  private final ImmutableList&lt;R&gt; rowList;<a name="line.145"></a>
<span class="sourceLineNo">146</span>  private final ImmutableList&lt;C&gt; columnList;<a name="line.146"></a>
<span class="sourceLineNo">147</span><a name="line.147"></a>
<span class="sourceLineNo">148</span>  // TODO(jlevy): Add getters returning rowKeyToIndex and columnKeyToIndex?<a name="line.148"></a>
<span class="sourceLineNo">149</span>  private final ImmutableMap&lt;R, Integer&gt; rowKeyToIndex;<a name="line.149"></a>
<span class="sourceLineNo">150</span>  private final ImmutableMap&lt;C, Integer&gt; columnKeyToIndex;<a name="line.150"></a>
<span class="sourceLineNo">151</span>  private final V[][] array;<a name="line.151"></a>
<span class="sourceLineNo">152</span><a name="line.152"></a>
<span class="sourceLineNo">153</span>  private ArrayTable(Iterable&lt;? extends R&gt; rowKeys,<a name="line.153"></a>
<span class="sourceLineNo">154</span>      Iterable&lt;? extends C&gt; columnKeys) {<a name="line.154"></a>
<span class="sourceLineNo">155</span>    this.rowList = ImmutableList.copyOf(rowKeys);<a name="line.155"></a>
<span class="sourceLineNo">156</span>    this.columnList = ImmutableList.copyOf(columnKeys);<a name="line.156"></a>
<span class="sourceLineNo">157</span>    checkArgument(!rowList.isEmpty());<a name="line.157"></a>
<span class="sourceLineNo">158</span>    checkArgument(!columnList.isEmpty());<a name="line.158"></a>
<span class="sourceLineNo">159</span><a name="line.159"></a>
<span class="sourceLineNo">160</span>    /*<a name="line.160"></a>
<span class="sourceLineNo">161</span>     * TODO(jlevy): Support empty rowKeys or columnKeys? If we do, when<a name="line.161"></a>
<span class="sourceLineNo">162</span>     * columnKeys is empty but rowKeys isn't, the table is empty but<a name="line.162"></a>
<span class="sourceLineNo">163</span>     * containsRow() can return true and rowKeySet() isn't empty.<a name="line.163"></a>
<span class="sourceLineNo">164</span>     */<a name="line.164"></a>
<span class="sourceLineNo">165</span>    rowKeyToIndex = index(rowList);<a name="line.165"></a>
<span class="sourceLineNo">166</span>    columnKeyToIndex = index(columnList);<a name="line.166"></a>
<span class="sourceLineNo">167</span><a name="line.167"></a>
<span class="sourceLineNo">168</span>    @SuppressWarnings("unchecked")<a name="line.168"></a>
<span class="sourceLineNo">169</span>    V[][] tmpArray<a name="line.169"></a>
<span class="sourceLineNo">170</span>        = (V[][]) new Object[rowList.size()][columnList.size()];<a name="line.170"></a>
<span class="sourceLineNo">171</span>    array = tmpArray;<a name="line.171"></a>
<span class="sourceLineNo">172</span>    // Necessary because in GWT the arrays are initialized with "undefined" instead of null.<a name="line.172"></a>
<span class="sourceLineNo">173</span>    eraseAll();<a name="line.173"></a>
<span class="sourceLineNo">174</span>  }<a name="line.174"></a>
<span class="sourceLineNo">175</span><a name="line.175"></a>
<span class="sourceLineNo">176</span>  private static &lt;E&gt; ImmutableMap&lt;E, Integer&gt; index(List&lt;E&gt; list) {<a name="line.176"></a>
<span class="sourceLineNo">177</span>    ImmutableMap.Builder&lt;E, Integer&gt; columnBuilder = ImmutableMap.builder();<a name="line.177"></a>
<span class="sourceLineNo">178</span>    for (int i = 0; i &lt; list.size(); i++) {<a name="line.178"></a>
<span class="sourceLineNo">179</span>      columnBuilder.put(list.get(i), i);<a name="line.179"></a>
<span class="sourceLineNo">180</span>    }<a name="line.180"></a>
<span class="sourceLineNo">181</span>    return columnBuilder.build();<a name="line.181"></a>
<span class="sourceLineNo">182</span>  }<a name="line.182"></a>
<span class="sourceLineNo">183</span><a name="line.183"></a>
<span class="sourceLineNo">184</span>  private ArrayTable(Table&lt;R, C, V&gt; table) {<a name="line.184"></a>
<span class="sourceLineNo">185</span>    this(table.rowKeySet(), table.columnKeySet());<a name="line.185"></a>
<span class="sourceLineNo">186</span>    putAll(table);<a name="line.186"></a>
<span class="sourceLineNo">187</span>  }<a name="line.187"></a>
<span class="sourceLineNo">188</span><a name="line.188"></a>
<span class="sourceLineNo">189</span>  private ArrayTable(ArrayTable&lt;R, C, V&gt; table) {<a name="line.189"></a>
<span class="sourceLineNo">190</span>    rowList = table.rowList;<a name="line.190"></a>
<span class="sourceLineNo">191</span>    columnList = table.columnList;<a name="line.191"></a>
<span class="sourceLineNo">192</span>    rowKeyToIndex = table.rowKeyToIndex;<a name="line.192"></a>
<span class="sourceLineNo">193</span>    columnKeyToIndex = table.columnKeyToIndex;<a name="line.193"></a>
<span class="sourceLineNo">194</span>    @SuppressWarnings("unchecked")<a name="line.194"></a>
<span class="sourceLineNo">195</span>    V[][] copy = (V[][]) new Object[rowList.size()][columnList.size()];<a name="line.195"></a>
<span class="sourceLineNo">196</span>    array = copy;<a name="line.196"></a>
<span class="sourceLineNo">197</span>    // Necessary because in GWT the arrays are initialized with "undefined" instead of null.<a name="line.197"></a>
<span class="sourceLineNo">198</span>    eraseAll();<a name="line.198"></a>
<span class="sourceLineNo">199</span>    for (int i = 0; i &lt; rowList.size(); i++) {<a name="line.199"></a>
<span class="sourceLineNo">200</span>      System.arraycopy(table.array[i], 0, copy[i], 0, table.array[i].length);<a name="line.200"></a>
<span class="sourceLineNo">201</span>    }<a name="line.201"></a>
<span class="sourceLineNo">202</span>  }<a name="line.202"></a>
<span class="sourceLineNo">203</span><a name="line.203"></a>
<span class="sourceLineNo">204</span>  private abstract static class ArrayMap&lt;K, V&gt; extends Maps.ImprovedAbstractMap&lt;K, V&gt; {<a name="line.204"></a>
<span class="sourceLineNo">205</span>    private final ImmutableMap&lt;K, Integer&gt; keyIndex;<a name="line.205"></a>
<span class="sourceLineNo">206</span><a name="line.206"></a>
<span class="sourceLineNo">207</span>    private ArrayMap(ImmutableMap&lt;K, Integer&gt; keyIndex) {<a name="line.207"></a>
<span class="sourceLineNo">208</span>      this.keyIndex = keyIndex;<a name="line.208"></a>
<span class="sourceLineNo">209</span>    }<a name="line.209"></a>
<span class="sourceLineNo">210</span><a name="line.210"></a>
<span class="sourceLineNo">211</span>    @Override<a name="line.211"></a>
<span class="sourceLineNo">212</span>    public Set&lt;K&gt; keySet() {<a name="line.212"></a>
<span class="sourceLineNo">213</span>      return keyIndex.keySet();<a name="line.213"></a>
<span class="sourceLineNo">214</span>    }<a name="line.214"></a>
<span class="sourceLineNo">215</span><a name="line.215"></a>
<span class="sourceLineNo">216</span>    K getKey(int index) {<a name="line.216"></a>
<span class="sourceLineNo">217</span>      return keyIndex.keySet().asList().get(index);<a name="line.217"></a>
<span class="sourceLineNo">218</span>    }<a name="line.218"></a>
<span class="sourceLineNo">219</span><a name="line.219"></a>
<span class="sourceLineNo">220</span>    abstract String getKeyRole();<a name="line.220"></a>
<span class="sourceLineNo">221</span><a name="line.221"></a>
<span class="sourceLineNo">222</span>    @Nullable abstract V getValue(int index);<a name="line.222"></a>
<span class="sourceLineNo">223</span><a name="line.223"></a>
<span class="sourceLineNo">224</span>    @Nullable abstract V setValue(int index, V newValue);<a name="line.224"></a>
<span class="sourceLineNo">225</span><a name="line.225"></a>
<span class="sourceLineNo">226</span>    @Override<a name="line.226"></a>
<span class="sourceLineNo">227</span>    public int size() {<a name="line.227"></a>
<span class="sourceLineNo">228</span>      return keyIndex.size();<a name="line.228"></a>
<span class="sourceLineNo">229</span>    }<a name="line.229"></a>
<span class="sourceLineNo">230</span><a name="line.230"></a>
<span class="sourceLineNo">231</span>    @Override<a name="line.231"></a>
<span class="sourceLineNo">232</span>    public boolean isEmpty() {<a name="line.232"></a>
<span class="sourceLineNo">233</span>      return keyIndex.isEmpty();<a name="line.233"></a>
<span class="sourceLineNo">234</span>    }<a name="line.234"></a>
<span class="sourceLineNo">235</span><a name="line.235"></a>
<span class="sourceLineNo">236</span>    @Override<a name="line.236"></a>
<span class="sourceLineNo">237</span>    protected Set&lt;Entry&lt;K, V&gt;&gt; createEntrySet() {<a name="line.237"></a>
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